Verizon's logo has a red Z and the word foundation.
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Zurich
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Amazon uses this shortened version of its logo. Normally their logo spells out the word "Amazon," and the arrow is underneath pointing from the a to the z, meaning that amazon sells everything from a to z. Sometimes they use the smaller logo of just the letter a and the arrow, though.
The company that has a logo containing two blue Z's is Blizzard. Blizzard is a gaming company that produces RPGs such as World of Warcraft, Diablo, and Starcraft.
The Allianz logo consists of the word "Allianz" in a distinct font with the letter "z" being emphasized with red color. The logo represents the company's brand identity and is meant to convey strength, stability, and reliability to customers.
Zippo Manufacturing Company (the one that makes cigarette lighters).
Zurich Insurance Company
Jay Z